Elastically Mounted Press Stroke Timing for Vibration Compensation
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Solution Overview
Problem
Elastically mounted forming machines experience unwanted rigid body motions due to inertial forces and moments of inertia, leading to mechanical stress and non-compliance with dimensional tolerances, which existing solutions attempt to mitigate with additional equipment like dampers or counterweights, increasing costs.
Innovation Solution
The method involves detecting and adapting the initiation time of the ram device's working stroke to match the instantaneous phase position of kinematic variables such as path, speed, or acceleration, counteracting the rigid body motion by introducing inertial forces in a phase-exact manner, thereby reducing tumbling or tilting motions without significant additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional compensating devices like dampers or counterweights are installed to counteract inertial forces and moments of inertia, then the rigid body motion and mechanical stress are reduced, but the device complexity and cost increase
Solution Approach 1:
The invention converts the harmful inertial forces and moments of inertia into a beneficial control signal. By detecting the rigid body motion caused by these inertial effects and using feedback control to adjust the drive, the system transforms the problem of vibration and stress into an opportunity for precise motion control without adding physical compensating mass or dampers
Solution Approach 2:
The invention implements a feedback control system where sensors detect kinematic variables (position, speed, acceleration) of the rigid body motion, and this information is fed back to the drive control. The controller adjusts the drive commands based on the detected motion to counteract inertial effects, eliminating the need for additional mechanical compensating devices
2Manufacturing precision
If the initiation time of the working stroke is adapted to the instantaneous phase position of kinematic variables, then the rigid body motion is counteracted and manufacturing precision is improved, but the control complexity increases
Solution Approach 1:
The invention uses feedback control where the initiation time of the working stroke is dynamically adjusted based on real-time detection of kinematic variables. The control system monitors position, speed, and acceleration to determine the optimal phase position for stroke initiation, thereby improving manufacturing precision through adaptive timing control
Solution Approach 2:
The invention changes the temporal parameter of the working stroke initiation by adapting it to the instantaneous phase position of kinematic variables. This parameter adjustment allows the system to counteract rigid body motion and improve dimensional tolerances by synchronizing the stroke initiation with the dynamic state of the machine
Data Source
AI summary
A method for operating an elastically mounted forming machine which is path-bound or force-dependent, in which method a working stroke of a ram device operatively connected to the drive is initiated by means of a drive, and a predefined forming process is carried out on a workpiece by moving the ram device during said working stroke, in particular due to the interaction of an upper tool located on the ram device with a lower tool located on a tool table, wherein the inertial forces and/or moments of inertia occurring during operation owing to the initiation of the working stroke and/or owing to an imbalance in the drive are at least partially compensated. The method, wherein at least one kinematic variable (s(t),v(t),a(t)) of a rigid body motion of the elastically mounted forming machine is detected during the operation thereof, wherein the time at which the working stroke is initiated is adapted to an instantaneous phase position of the at least one kinematic variable (s(t),v(t),a(t)) of the rigid body motion in order to generate inertial forces and/or moments of inertia so as to counteract the rigid body motion of the forming machine.